<template>
  <!-- 头部部分 -->
  <header class="header">
    <h1>todos</h1>
    <input  
    v-model.trim="name"
     @keyup.enter="add" 
     @keyup.esc="name=''"
     class="new-todo" 
     placeholder="请输入任务名称" 
     autofocus />
  </header>
</template>

<script>
export default {
  data () {
    return {
      name:""
    }
  },
  methods: {
    add(){
      if(this.name==='') return alert (`不能这样哦`)
      this.$emit(`add-event`,this.name)
      this.name =''
    },
  }
}
</script>

<style></style>
